code: def hub_name(self, url: str):
      self.data.server = url
      self.flush()
  
imports: import hashlib
  import os
  import time
  import json
  import uuid
  import yaml
  from easydict import EasyDict
  import paddlehub.env
label_desc: Use image node_id 4 for calling the CacheConfig obj's underlying member method code with example usage: obj.hub_name(url) without return types